[FFmpeg-devel] [PATCH 00/15] OpenCL infrastructure, filters

[Rostislav Pehlivanov]

On 14 November 2017 at 19:47, Mark Thompson <sw at jkqxz.net> wrote:

> Changes since the last time this was posted:
> * Add unsharp filter (to replace existing unsharp).
> * Remove old experimental API.
> * Miscellaneous fixes.
>
> Now also tested with AMD OpenCL on Windows (DXVA2 mapping works nicely,
> D3D11 does not because it wants the Intel extension for NV12 support).
>
> Thanks,
>
> - Mark
>
>
> Silly example using everything (for i965 VAAPI + Beignet):
>
> ./ffmpeg_g -y -init_hw_device vaapi=va:/dev/dri/renderD128 -init_hw_device
> opencl=ocl at va -hwaccel vaapi -hwaccel_device va -hwaccel_output_format
> vaapi -i in.mp4 -f image2 -r 1 -i overlays/%d.png -an -filter_hw_device ocl
> -filter_complex '[1:v]format=yuva420p,hwupload[x2];
> [0:v]scale_vaapi=1280:720:yuv420p,hwmap[x1]; [x1][x2]overlay_opencl=0:0,
> program_opencl=test.cl:rotate_image,unsharp_opencl=lx=17:ly=
> 17:la=5,hwmap=derive_device=vaapi:reverse=1,scale_vaapi=1280:720:nv12'
> -c:v h264_vaapi -frames:v 1000 out.mp4
>
> test.cl:
>
> __kernel void rotate_image(__write_only image2d_t dst,
>                            __read_only  image2d_t src,
>                            unsigned int index)
> {
>   const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
>                              CLK_FILTER_LINEAR);
>
>   float angle = (float)index / 100;
>
>   float2 dst_dim = convert_float2(get_image_dim(dst));
>   float2 src_dim = convert_float2(get_image_dim(src));
>
>   float2 dst_cen = dst_dim / 2;
>   float2 src_cen = src_dim / 2;
>
>   int2   dst_loc = (int2)(get_global_id(0), get_global_id(1));
>
>   float2 dst_pos = convert_float2(dst_loc) - dst_cen;
>   float2 src_pos = {
>     cos(angle) * dst_pos.x - sin(angle) * dst_pos.y,
>     sin(angle) * dst_pos.x + cos(angle) * dst_pos.y
>   };
>   src_pos = src_pos * src_dim / dst_dim;
>
>   float2 src_loc = src_pos + src_cen;
>
>   if (src_loc.x < 0         || src_loc.y < 0 ||
>       src_loc.x > src_dim.x || src_loc.y > src_dim.y)
>     write_imagef(dst, dst_loc, 0.5);
>   else
>     write_imagef(dst, dst_loc, read_imagef(src, sampler, src_loc));
> }
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>


Reviewed and tested, LGTM from me